Butterfly valve



s. P. KlNNEY ETAL 2,393,170

BUTTERFLY VALVE Filed Jan. 5, 1944 2 sheets-sheet 1 I. HIII lllll Jan.15, 1946.

Jan. l5, 1946 s. P. KINNEY E'f Al. 2,39370 BUTTERFLY vALvE`- v 'FiledJap. 5, 1944 2 sheets-sheet 2 xNvENToRs SeZwyne. Kinn ey Louis M-HartwikPatented Jan. 15, 1946 BUTTERFLY VALVE Selwyne P. Kinney, Grafton, andLouis M. Hartwick, Beaver, Pa., assignors to Selwyne 1. Kinney, doingbusiness as S. P. Kinney Engineers,

Pittsburgh, Pa.

Application January 5, 1944,' Serial No. 517,039

(Cl. 13S-37) 13 Claims.

This invention relates to valves, and more particularly, though notexclusively, to valves for those industrial apparatus in which butterflyvalves are normally used, and especially to valves used in conduitscarrying high temperature gases.

The usual butterfly valve consists in a plate or disk having aperipheral outline substantially the same as the cross sectional form ofthe passage in which the valve is mounted to control the flow of fluid.The disk is rotatable on a diametrical axis, between a position in whichthe disk extends transversely of the passage and closes the passage tofiow, and a position in which the disk extends on the longitudinalcenter line of the passage, leaving the passage substantiallyunrestricted to flow. The disk is adjustable to flow-'controllingpositions intermediate the two limits mentioned.

It will be understood that when the disk is in an intermediate positionof adjustment the body of the disk is inclined to the axis of thepassage, whereby the stream of uid flowing in the passage is deflectedby the inclined body of the disk, causing the stream to impinge againstthe wall of the passage. If, as is the case in numerous industrialinstallations, the flowing stream of liquid or gas contains particles ofabrasive material, or

by reason of its high temperature or composition is highly corrosive,the wall of the conduit on the downstream side of the valve is subjectto the c destructive action of the deflected stream of fluid,

and `sooner' or later the wall of the passage is worn` to destruction.This circumstance, manifestly objectionable in whatever field ofindustry it is encountered, is particularly serious in the steelindustry, where large refractory lined conduits carry hot gases ladenwith particles of ash, slag, metal, or ore.

As a specific example, the ue that carries the outgo gases of a blastfurnace may be cited. These gases are hot, and entrained in them aresubstantial quantities of nely divided iron ore, known as flue dust. Theflue is constructed of plate steel, lined with refractory material toprotect the steel walls of the flue. 'The gases contain large quantitiesof carbon-monoxide, and they are cleansed of flue dust and used as fuelfor the air-preheating stoves, steam-generating boilers, or other firedequipment of the blast furnace plant, The conventional butterfly valve,provided to control the flow between the furnace and the gas washer orflue-dust precipitator, is instrumental in causing rapid erosion of therefractory lining of the flue under the impngement yof the dust-ladengases, and it will be understood of the gases is relatively high, therefractory lining is rendered yet more vulnerable to the deleteriousconditions.

The invention consists in the provision of a butteriiy valve which inopen or partially open position concentrates the ow of the stream offlue gases ,more nearly towards the center of the valve structure andthe longitudinal axis of the flue, whereby the objection noted iseliminated, or is so far reduced as to be inconsequential. Whereas theconventional butterfly valve consists in a single wing or disk mountedto swing on a diametrical axis, the butterfly valve of this inventioncomprises a pair of complementary wings or disk members. The paired diskmembers are severally mounted to swing between open and vclosedpositions, and in open or partially open ence to the accompanyingdrawings, in which:

Figure i is a View in side elevation of a valve structure that embodiesthe invention;

Figure 2 is a view in medial and vertical section through the valvestructure, with adjacent portions of the refractory lined flue in whichthe valve is included shown fragmentarily; and

Figure 3 is a transverse sectional view o-f the valve structure, on theplane III-III of Figure 2. The plane of section of Figure 2 is indicatedat IIV-II in Figure 3. .Y

The body of the valve structure here comprises an annulus or cylinder 2,having peripheral flanges 3 reinforced by means of angle webs 4. Thebody may be, and is here shown to be, cast integrally of iron or steel,and in the case of the exemplary blast furnace installation in mind, acast steel of 12 per cent manganesecontent may be used. The plate steelbody 5 of the iiue F, in which the valve is embodied, is provided withcircumferential fianges E, and bolts or screws l secure the anges 6 tothe iianges 3 and thus integrate the valve body with the flue structure.The steel wall of the flue is provided with the usual lining 8 ofrefractory material, and the internal cylindrical surface of such liningis flush with the inner surface of the annular body of the valve.

The butterfly valve per se of the structure is of bipartiteconstruction, comprising a pair of wings or gates 9 and l0 which may beformed of ametrical edges of their semi-circular bodies` positionedadjacent to each other, in a common plane across the interior of thecylindrical valve Y body. The disks are shown inrsuch position inelevation in Figure 3 and inV vertical section in Figure 2. In thisposition of the vali/ eYnuerrlbers,

the passage through the flue is closed, not necessarily hermeticallyclosed as herein illustrated,

and the flow of the flue-dust laden gases through the duct is blocked.The two valve membersor Wings are rotatable in their mountings from saidclosedposition into the open or partially open position shown indottedlines: in Figure 2, and it is important to note that in such` openposition the valve members 9 and I0 diverge in the upstream direction tothereby `form a somewhat funnel-like opening that isV aligned with thelongitudinal axis of the iiue F and is effective across the entirewidthof the throat of the Valve body. By virtue of such feature ofconstruction the flow through the ue With the valve in fully (orpartially) open position is concentrated along the longitudinal axisofthe liuc. The marginal -ilow of gas which occurs over the outerperipheral 'edges' of the valve disks flows into a space that divergesin a downstream direction and thus avoids direct impingement against therefractory lining. The gates or wings may be moved to an even morewidely open position in which they curved as indicated at 9a and I 0a,respectively,

the direction of curvature being such as to provide a, rounded neck inthe funnel of the open valve.

Itis to be noted that the axes, on which the valve members are rotatablebetween open and closed positions, are located at an interval from thediametrical or inner edges of saidA members Yor gates, and' that suchinterval is smaller or less than the interval between the axes and theopposite outer edges of the gates as may be seen in Fig. 2. The axes orstems of the valve disks may comprise shafts il and I 2 that extendacross thev throat of the valve-body in spaced-apart and parallelrelation, as shown in Figure 3. These stems are borne at their oppositeends in antifriction bearings E13 supported in housing portions H5,formed integrally with the valve body 2.

Particularly effective means are provided for securing the valve gatesto their rotatable stems or shafts, such means permitting the readymounting and attachment of the gates upon the provided with suitableorices through which 1' such Cotter-pin keepers are driven. The taperedkeepers engage the outer flat faces of the embraced valve stems withwedging effect, and provide perfect security of assembly. The split endsof thekeepersmay, after installation be spread, as indicatedlat 'H inFigure 3, to prevent them from becoming dislocated in service.

While it is possible that the valve gates may be rindividually rotatedbetween open and closed positions, it is desirable that they be rotatedin unison. Means. to this end comprise arms I8 and dnanner wellunderstood in the art.

The inner edges of the gates are preferably provided with a rounded lipor head that resists corrosive action and retards splittingV or warpingof the disk, while the reinforcing Vstructure formed by the webs andchannels on the downstream faces of the gates. prevents warpage andprovides added heat dissipating surface.

The buttery valve of the invention, while particularly desig-ned for theservice indicated, will find utility in many other fields. Needless tosay, various modifications and changes in the structure ofthe'valvedescribed may be made Without departing fror'nthe spirit of theinvention dened in the vappended, claims.

`We claim asour invention.;

l. A valve structure including a body forming a valve throat, twobutterfly gates mounted in said throat to extend in substantially acommon plane across saidthroat, saidgates being movable from such planeVinto a funnel-like position to permit lGW centrally through saidthroat.A

stems, and affording facility of removal of the Y to reinforce the gate.The paired angemem# bers i5 form channels in which the valve stems 2,The structure of the next preceding claim, the bodiesV of, said: gatesbeing curved towards-the edges that are adjacent when the `gates extendin said common plane, whereby turbulence of flow through the valve .inopen position is minimized.

3. A valveV structure including a body: forming a valve throat, two.`valve stems mounted inf` said body and extending inspaced-apartparallel' relation acrosssaidthroat, two butteriiygates eachhaving open channel'portions adapted to Vembrace one of saidv stems,lkeepers cooperating with the anges of saidI channel portions to securesaid gatesone to each of said stems, said gates being complementary'inshape and adapted in flowthrott'lingposition to extend in substantiallya common plane across-saidthr'oat, and means for turni-ngr said stems toswing said gates from said plane to open Aa passage for fiow betweenthem.

4j. Agvalve structure including a diskarranged inthe throat of thevalve, a stem'extending transverselypof theLvaix/ie throat, saidfdisuhaving flanges forming an open channel to receive said stem, and meansanchored to said flanges for securing the diskin locked position on thestem.

5. A valve structure including a disk arranged in the throat of thevalve, a stem extending transversely of the valve throat, said diskhaving flanges forming an open channel to receive said stem, said stemhaving a at surface, and means carried by said iianges and lockedagainst said at surface to secure the disk to the stem.

6. A valve structure including a disk arranged in the throat of thevalve, a stem of polygonal cross section extending transversely of thevalve throat, said disk having members forming an open channel embracingsaid stem, and wedge elements locked in said members and wedged againsta face of said stem to secure the disk to the stem. g

7. A valve for controlling the flow of high temperature gases comprisinga body in the form of an annulus, a pair of shafts equidistantly spacedfrom a given diameter of said annulus and having their ends passingthrough the annulus, and a substantially semi-circular butterfly gate oneach shaft and of a shape and area to substantially cover one-half theinterior of the passage through the annulus.

8. A valve for controlling the flow of high temu perature gasescomprising a body in the form of an annulus, a pair of shaftsequidistantly spaced from a given diameter of said annulus and havingtheir ends'passing through the annulus, and a substantiallysemi-circular butterfly gate on each shaft and of a shape and area tosubstantially cover one-half the interior of the passage through theannulus, said gates having plane faces in an upstream direction with theedge portions thereof which are along the meeting line of the two gatescurved in a downstream direction from said plane, and a reinforcingstructure on the downstream side of said gates.

9. A valve structure for controlling the flow of a iiuid comprising abody having a passage therethrough, and two gates each mounted to turnin said passage on an axis extending transversely and medially of thegate to swing between a position in which the two gates close thepassage and a position in which the gates form a funnel-like passagewayat the center of the passage.

10. A valve structure for controlling the ow of a fluid comprising abody having a passage therethrough, and two butterfly gatescomplementary in form and mounted in said passage with their axes inspaced relation to swing between a position in which the gates close thepassage and a position in which the gates form in the passage afunnel-like passageway extending between said axes.

11. A valve structure for controlling the flow of a uid comprising abody having a passage of circular cross section therethrough, and twosemi-circular butterfly gates mounted in said passage with their axes inspaced parallel relation and positioned to swing on said axes between aposition in which the gates close the passage and a position in whichthe gates form in the passage a funnel-like passageway extending betweensaid axes.

12. The structure of the next-preceding claim, the axis of eachbutterfly gate being spaced at a smaller interval from the inner thanfrom the outer edge of the gate, and means for swinging the gates toVpresent the larger end of said funnel-like passageway in upstreamdirection in the valve passage.

13. A valve structure for controlling the flow of a fluid comprising avalve body having a passage therethrough, and two butteriiy gatesmounted in said passage with their axes in spaced parallel relation toswing between a position in which the gates close the passage and aposition in which the gates form in the passage a funnellike passagewayextending between said axes, the body portions of said gates that extendbetween said axes when the passage is closed being complementarilycurved, substantially as described.

SELWYNE P. KINNEY. LOUIS M. HAR'I'WICK.

